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Issue A&A
Volume 415, Number 2, February IV 2004
Page(s) L27 - L30
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20040006



A&A 415, L27-L30 (2004)
DOI: 10.1051/0004-6361:20040006

Letter

Discovery of the high-ionization emission line [Ne V] $\lambda$3426 in the blue compact dwarf galaxy Tol 1214-277

Y. I. Izotov1, K. G. Noeske2, 3, N. G. Guseva1, P. Papaderos2, T. X. Thuan4 and K. J. Fricke2

1  Main Astronomical Observatory, Ukrainian National Academy of Sciences, Zabolotnoho 27, Kyiv 03680, Ukraine
2  Universitäts-Sternwarte, Geismarlandstraße 11, 37083 Göttingen, Germany
3  University of California, 1156 High St., Santa Cruz, CA 95064, USA
4  Department of Astronomy, University of Virginia, Charlottesville, VA 22903, USA



(Received 14 November 2003 / Accepted 10 January 2004)

Abstract
The discovery of the high-ionization [Ne V] $\lambda$3426 Å emission line in the spectrum of the blue compact dwarf (BCD) galaxy Tol 1214-277 is reported. The detection of this line implies the presence of intense ionizing X-ray emission with a luminosity $L_{\rm x}$ in the range 10 39-10 40 erg s -1. Such a high X-ray luminosity cannot be reproduced by models of massive stellar populations. Other mechanisms, such as fast shocks or accretion of gas in high-mass X-ray binaries need to be invoked to account for the high intensity of the [Ne V] $\lambda$3426 Å emission line.


Key words: galaxies: abundances -- galaxies: dwarf -- galaxies: evolution -- galaxies: compact -- galaxies: starburst -- galaxies: stellar content -- galaxies: individual Tol 1214-277

Offprint request: Y. I. Izotov, izotov@mao.kiev.ua

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